NEW YORK (CBSNewYork) — Mail something through the post office that didn’t make it on time for Christmas?

As WCBS 880’s Ginny Kosola reported, it’s possible you didn’t understand the way priority mail is delivered.

READ MORE: New York State To Adopt New CDC Guidelines For Vaccinated People Starting This Wednesday, Cuomo Says

If you used the United States Postal Service’s priority mail thinking it would be delivered in two days, you should know, the post office says the service is not guaranteed to arrive on a particular day.

For that, you need to send things priority express mail, Kosola reported.

READ MORE: New Jersey Schools To Fully Reopen For In-Person Classes This Fall, Gov. Murphy Says

The postal service says it did have a terrific season, delivering approximately 560 million packages between Thanksgiving and Christmas.

The agency predicted an increase of 12 percent in package volume, but instead saw a 26 percent increase.

Check Out These Other Stories From

MORE NEWS: NYC Adding 250 NYPD Officers To Subways As 24-Hour Service Resumes

[display-posts category=”news” wrapper=”ul” posts_per_page=”4″]